<template>
	<view>
		<!-- 自定义搜索组件 -->
		<my-search @my-click="gotoSearch"></my-search>
		
		<view class="scroll-view-container">
			<!-- 左侧滚动视图区 -->
			<scroll-view scroll-y="true" :style="{height: wh+'px'}" class="left-scroll-view">
				<block v-for="(item,i) in cateList" :key="item.cat_id" >
					<view :class="['left-scroll-view-item', i === active ? 'active' : '']" 
							@click="activeChange(i)">
						{{item.cat_name}}
					</view>
				</block>

			</scroll-view>
			<!-- 右侧滚动视图区 -->
			<scroll-view scroll-y="true" :scroll-top="scrollTop" :style="{height: wh+'px'}" >
				<!-- 二级分类列表区 -->
				<view class="cate-lv2" v-for="item2 in cateLevel2" :key="item2.cat_id">
					<!-- 二级分类标题-->
					<view class="cate-lv2-title">/{{item2.cat_name}}/</view>
					<!-- 三级分类列表区 -->
					<view class="cate-lv3-list">
						<view class="cate-lv3-item"  v-for="item3 in item2.children" :key="item3.cat_id" @click="gotoGoodsList(item3)">
							<!-- 图片 -->
							<image :src="item3.cat_icon.replace('dev','web')" alt="">
							<!-- 文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
						
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				// 设备可用高度
				wh: 0,
				// 分类列表数据
				cateList: [],
				// 二级分类列表
				cateLevel2:[],				
				// 默认激活项
				active:0,
				// 右侧滚动条位置
				scrollTop:0
			}
		},
		methods: {
			// 获取分类列表
			async getCateList() {
				const res = await uni.$http.get('/api/public/v1/categories')
				if (res.data.meta.status !== 200) {
					return uni.$showMsg()
				}
				this.cateList = res.data.message
				// 二级分类赋值
				this.cateLevel2 = res.data.message[0].children
			},
			
			// 一级分类点击事件
			activeChange(i){
				this.active=i
				// 重新为二级分类赋值
				this.cateLevel2 = this.cateList[i].children
				// 重置右侧滚动条位置
				this.scrollTop = this.scrollTop === 0? 0.1 : 0
			},
			// 三级分类点击事件
			gotoGoodsList(item3){
				uni.navigateTo({
					url:'/subpkg/goods-list/goods-list?cid='+item3.cat_id
				})
			},
			// 搜索框
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}

		},
		onLoad() {
			// 获取设备信息
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight-50
			// 调用获取分类方法
			this.getCateList()
		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;

		.left-scroll-view {
			width: 120px;

			.left-scroll-view-item {
				background-color: #f7f7f7;
				line-height: 60px;
				text-align: center;
				font-size: 12px;

				&.active {
					background-color: #FFFFFF;
					position: relative;

					&::before {
						content: '';
						display: block;
						width: 3px;
						height: 30px;
						background-color: #C00000;
						position: absolute;
						top: 50%;
						transform: translateY(-50%);
					}
				}
			}
		}
		
			.cate-lv2-title{
				font-size: 12px;
				font-weight: bold;
				text-align: center;
				padding: 15px 0;
			}
			
			.cate-lv3-list{
				display: flex;
				flex-wrap: wrap;				
				
				.cate-lv3-item{
					width: 33.33%;
					display: flex;
					flex-direction: column;
					justify-content: center;
					align-items: center;
					margin-bottom: 10px;
					
					image{
						width:60px;
						height: 60px;
					}
					text{
						font-size: 12px;
						
					}
				}
			}
	}
</style>
